Member predicate IRGuardCondition::ensuresLtEdge
Holds if (determined by this guard) op < k must be isLessThan on the edge from
pred to succ. If isLessThan = false then this implies op >= k.
Holds if (determined by this guard) op < k must be isLessThan on the edge from
pred to succ. If isLessThan = false then this implies op >= k.